The formula H2O is also the molecular formula of water. For non-molecular substances such as table salt, we represent the composition with an empirical formula. Sodium chloride is represented by NaCl, meaning that sodium and chlorine ratio in sodium chloride is 1 to 1. Again, the subscript 1 is omitted.
By Phil Myers. The annelids include earthworms, polychaete worms, and leeches. All members of the group are to some extent segmented, in other words, made up of segments that are formed by subdivisions that partially transect the body cavity.Segmentation is also called metamerism.y Phil Myers. The annelids include earthworms, polychaete worms, and leeches. All members of the group are to some extent segmented, in other words, made up of segments that are formed by subdivisions that partially transect the body cavity.
Tropical rainforest, polar ocean, the digestive tract of an insect or a mammalâtheyâre all worm habitats. Worms also observe an array of different feeding strategies. Parasites, predators, grazers, detritivores, filter-feedersâ there are worms enjoying every menu in nature.f the thirty-odd phyla in the animal kingdom, at least a third are generally referred to as worms. If you include the more exotic, lesser-known phyla described as âworm-like,â itâs well over half. So, evolutionarily speaking, it might be easier to narrow down whatâs not a worm.